I think Pyke will be played anywhere but support.
I feel like Pyke kit is better suited for jungle, I haven't tested him on PBE nor i think about doing so, the champ really doesn't catch my attention.
His camp clear may be garbage, but he has a stun and can get scuttle crab fairly easily, so I don't think it would be much of a problem. His Q maybe do low damage, but still might help in raptors. And he seems like he can kite the camps quite well.
His passive converts HP into AD. Like I know this is because there's literally no support item that gives AD and most support items give HP instead, but this just encourages Pyke to build black cleaver and bruiser items and go something like Domination + Resolve.
His Q is amazing at setting up ganks. It's as scary as thresh or blitz walking to your kane to gank.
His W to avoid wards and gank faster and better? Yes please.
His E that looks like an amazing setup to kill along your laner? Oh god.
His ult duplicates gold and can set both your laner and you far ahead, no more laners flaming you because you ks kills.
And he doesn't fall-off lategame with such a game changing ult.
Like yeah he can be a "support" but I bet they'll all rush drakthar or something like that before even upgrading the ward item. Junglers have better gold income and that's better for him to buy items, carry your whole team and out of nowhere your team has a huge lead.
Also, I think classic support mains like myself (dirty Lulu main) won't even touch him. I know for certain he's the solution to Riot problem "nobody likes support", so they made an assassin with the excuse he is support so assassin mains don't feel bad when autofilled support.
tl;dr I predict he'll end up as a Jungler.